**Vote for this answer if you think the Bitcoin site should keep the existing scope that encourages questions about alternative cryptocurrencies** (except those which are more appropriately posted to their own dedicated graduated SE site, such as [Ethereum][1]).

Other than Ethereum, there is no other Stack Exchange site relating to cryptocurrency that is guaranteed to stick around. Proposals in Area 51 (eg [the Blockchain Technology one][2]) are of little use to people who want their questions answered until they at least reach public beta. Even sites in public beta (such as [the Monero one][3]) may not exist long term. 

**The choice of name for the graduated Bitcoin site should be made once a choice of scope has been finalised.**

ps: If you see further implications of reducing the scope of the site, please edit them in to this answer...

  [1]: https://ethereum.stackexchange.com/
  [2]: https://area51.stackexchange.com/proposals/106592/blockchain-technology
  [3]: https://monero.stackexchange.com